diff --git a/inc/certs.inc b/inc/certs.inc
index 07a6edb2..6c9e6d95 100755
--- a/inc/certs.inc
+++ b/inc/certs.inc
@@ -19,7 +19,7 @@ NEWCERT(){
 		echo 
 		
 		# $CERT_DAEMON certonly --webroot -w ${NM_CERTPATH}/letsencrypt-acme-challenge -d ${NEW_CERT}
-		$CERT_DAEMON certonly --webroot -PreferredChain "ISRG Root X1" -w ${NM_CERTPATH}/letsencrypt-acme-challenge -d ${NEW_CERT}
+		$CERT_DAEMON certonly --webroot --preferred-chain "ISRG Root X1" -w ${NM_CERTPATH}/letsencrypt-acme-challenge -d ${NEW_CERT}
 		# $CERT_DAEMON certonly --dry-run --webroot -w ${NM_CERTPATH}/letsencrypt-acme-challenge -d ${NEW_CERT}
 		
 		chown -R root:le ${NM_CERTPATH}